This app was mentioned in 4 comments, with an average of 3.25 upvotes
I use this watch face. It should fit your needs very well. I have taken my watch surfing a few times, and it's been fine, but I still probably wouldn't recommend it.
That's Surf Line: https://play.google.com/store/apps/details?id=com.surfline.watchface
Haven't tried it, but...
https://play.google.com/store/apps/details?id=com.surfline.watchface
There's a cool watchface called Surfline that tracks tides. Works well on both square and round watches.